Extension of posterior fossa tumors, particularly intraventricular fourth ventricle tumors, into the upper cervical spinal canal.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000792:Angiography; D001932:Brain Neoplasms / Q000000981:diagnostic imaging*; D002531:Cerebellum / Q000000981:diagnostic imaging; D002551:Cerebral Ventricle Neoplasms / Q000000981:diagnostic imaging*; D014695:Cerebral Ventriculography; D002648:Child; D002675:Child, Preschool; D002830:Choroid Neoplasms / Q000000981:diagnostic imaging; D002831:Choroid Plexus / Q000000981:diagnostic imaging; D004806:Ependymoma / Q000000981:diagnostic imaging; D005260:Female; D006391:Hemangioma / Q000000981:diagnostic imaging; D006801:Humans; D007223:Infant; D008297:Male; D008527:Medulloblastoma / Q000000981:diagnostic imaging; D008875:Middle Aged; D009192:Myelography; D009442:Neurilemmoma / Q000000981:diagnostic imaging; D010212:Papilloma / Q000000981:diagnostic imaging; D011011:Pneumoencephalography; D013115:Spinal Canal / Q000000981:diagnostic imaging*